Players play a Magic subgame under the table, starting at 5 life and using their libraries as their decks. The winner searches their library for two cards, puts those cards into their hand, then shuffles.
If Enter the Dungeon is cast during a subgame, a sub-subgame begins, preferably under a new, smaller table, but do what you can. The winner of the sub-sub game would search their subgame library for two cards.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.